Use wvdial

Everybody wants to use kppp.
If kppp works for you, you do not need to read further.

Wvdial is a simple, commmand line, no GUI, program to launch a modem session,not as fancy as kppp etc..., but much superior for debugging, because it produces complete information on what happens during the attempt/success to establish a modem communication.

There are two commands and one configuration file associated with wvdial.